As the first step in an effort to improve robustness of the cloud print proxy...

chrome/service/service_utility_process_host.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_SERVICE_SERVICE_UTILITY_PROCESS_HOST_H_
 #define CHROME_SERVICE_SERVICE_UTILITY_PROCESS_HOST_H_
 #pragma once
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif  // defined(OS_WIN)
 
+#include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/ref_counted.h"
 #include "base/task.h"
 #include "ipc/ipc_channel.h"
 #include "chrome/service/service_child_process_host.h"
 #include "printing/native_metafile.h"
 
 class CommandLine;
 class ScopedTempDir;
 
 namespace base {
 class MessageLoopProxy;
 }  // namespace base
 
 namespace gfx {
 class Rect;
 }  // namespace gfx
 
 namespace printing {
 struct PageRange;
+struct PrinterCapsAndDefaults;
 }  // namespace printing
 
 // Acts as the service-side host to a utility child process. A
 // utility process is a short-lived sandboxed process that is created to run
 // a specific task.
 class ServiceUtilityProcessHost : public ServiceChildProcessHost {
  public:
   // Consumers of ServiceUtilityProcessHost must implement this interface to
   // get results back.  All functions are called on the thread passed along
   // to ServiceUtilityProcessHost.
   class Client : public base::RefCountedThreadSafe<Client> {
    public:
     Client() {}
 
     // Called when the child process died before a reply was receieved.
     virtual void OnChildDied() {}
 
     // Called when at least one page in the specified PDF has been rendered
     // successfully into |metafile|.
     virtual void OnRenderPDFPagesToMetafileSucceeded(
         const printing::NativeMetafile& metafile,
         int highest_rendered_page_number) {}
     // Called when no page in the passed in PDF could be rendered.
     virtual void OnRenderPDFPagesToMetafileFailed() {}
 
+    // Called when the printer capabilities and defaults have been
+    // retrieved successfully.
+    virtual void OnGetPrinterCapsAndDefaultsSucceeded(
+        const std::string& printer_name,
+        const printing::PrinterCapsAndDefaults& caps_and_defaults) {}
+
+    // Called when the printer capabilities and defaults could not be
+    // retrieved successfully.
+    virtual void OnGetPrinterCapsAndDefaultsFailed(
+        const std::string& printer_name) {}
+
    protected:
     virtual ~Client() {}
 
    private:
     friend class base::RefCountedThreadSafe<Client>;
     friend class ServiceUtilityProcessHost;
 
     void OnMessageReceived(const IPC::Message& message);
     // Invoked when a metafile file is ready.
     void MetafileAvailable(const FilePath& metafile_path,
                            int highest_rendered_page_number);
 
     DISALLOW_COPY_AND_ASSIGN(Client);
   };
 
   ServiceUtilityProcessHost(Client* client,
                             base::MessageLoopProxy* client_message_loop_proxy);
   virtual ~ServiceUtilityProcessHost();
 
   // Starts a process to render the specified pages in the given PDF file into
   // a metafile. Currently only implemented for Windows. If the PDF has fewer
   // pages than the specified page ranges, it will render as many as available.
   bool StartRenderPDFPagesToMetafile(
       const FilePath& pdf_path,
       const gfx::Rect& render_area,
       int render_dpi,
       const std::vector<printing::PageRange>& page_ranges);
 
+  // Starta a process to get capabilities and defaults for the specified

[Scott Byer, 2010/12/20 21:02:29]

nit: spelling

[sanjeevr, 2010/12/21 21:28:45]

Done.

+  // printer. Used on Windows to isolate the service process from printer driver
+  // crashes by executing this in a separate process. The process does not run
+  // in a sandbox.
+  bool StartGetPrinterCapsAndDefaults(const std::string& printer_name);
+
  protected:
   // Allows this method to be overridden for tests.
   virtual FilePath GetUtilityProcessCmd();
 
   // Overriden from ChildProcessHost.
   virtual bool CanShutdown();
   virtual void OnChildDied();
 
  private:
   // Starts a process.  Returns true iff it succeeded.
-  bool StartProcess(const FilePath& exposed_dir);
+  bool StartProcess(bool no_sandbox, const FilePath& exposed_dir);
 
   // IPC messages:
   virtual void OnMessageReceived(const IPC::Message& message);
   // Called when at least one page in the specified PDF has been rendered
   // successfully into metafile_path_;
   void OnRenderPDFPagesToMetafileSucceeded(int highest_rendered_page_number);
   // Any other messages to be handled by the client.
   bool MessageForClient(const IPC::Message& message);
 
 #if defined(OS_WIN)  // This hack is Windows-specific.
   void OnPreCacheFont(LOGFONT font);
 #endif  // defined(OS_WIN)
 
   // A pointer to our client interface, who will be informed of progress.
   scoped_refptr<Client> client_;
   scoped_refptr<base::MessageLoopProxy> client_message_loop_proxy_;
   bool waiting_for_reply_;
   // The path to the temp file where the metafile will be written to.
   FilePath metafile_path_;
   // The temporary folder created for the metafile.
   scoped_ptr<ScopedTempDir> scratch_metafile_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceUtilityProcessHost);
 };
 
 #endif  // CHROME_SERVICE_SERVICE_UTILITY_PROCESS_HOST_H_